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firstly, HTML is not a scripting language: it is just a text mark-up language. For comparison, JavaScript is a scripting language.

In the history of text mark-up languages, it might be depicted something like this:

Code:

SGML
/ \
/ \
/ \
HTML XML
\
\
\
XHTML

Textually, I might say that XHTML is a sub-set of XML designed to express HTML-type mark-up in an XML format. Their shared inheritance from SGML means the syntax is very similar (in most cases it can be identical), and XHTML was intentionally designed to include most/all of the same functionality as HTML, including most element names.

"Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
~ Terry Pratchett in Nation

Basic meaning of html
XHTML stands for EXtensible HyperText Markup Language
XHTML is almost identical to HTML 4.01
XHTML is a stricter and cleaner version of HTML 4.01
XHTML is HTML defined as an XML application
XHTML is supported by all major browsers.

Why XHTML ?

Many pages on the internet contain "bad" HTML.

The following HTML code will work fine if you view it in a browser (even if it does NOT follow the HTML rules):
<html>
<head>
<title>This is bad HTML</title>
<body>
<h1>Bad HTML
<p>This is a paragraph
</body>

XML is a markup language where documents must be marked up correctly and "well-formed".

XHTML has a more strict syntax rules in comparison of HTML. XHTML gives you a more consistent, well structured format so that your webpages can be easily parsed and processed by present and future web browsers. It also makes your website more easy to maintain, edit, convert and format in the long run.

Since XHTML is an official standard of the World Wide Web Consortium (W3C), your website will more likely will be more compatible to more browsers and will be rendered more accurately. XHTML combines strength of HTML and XML and XHTML pages can be rendered by all XML enabled devices.

XHTML defines a quality standard for your webpages, if you follows that then your web pages will be counted quality web pages and W3C certifies those pages with their quality stamp.

Web developers and web browser designers are constantly discovering new ways to express their ideas through new markup languages. In XML, it is relatively easy to introduce new elements or additional element attributes. The XHTML family is designed to accommodate these extensions through XHTML modules and techniques for developing new XHTML-conforming modules. These modules will permit the combination of existing and new feature sets when developing content and when designing new user agents.

Basic meaning of html
XHTML stands for EXtensible HyperText Markup Language
XHTML is almost identical to HTML 4.01
XHTML is a stricter and cleaner version of HTML 4.01
XHTML is HTML defined as an XML application
XHTML is supported by all major browsers.

Why XHTML ?

Many pages on the internet contain "bad" HTML.

The following HTML code will work fine if you view it in a browser (even if it does NOT follow the HTML rules):
<html>
<head>
<title>This is bad HTML</title>
<body>
<h1>Bad HTML
<p>This is a paragraph
</body>

XML is a markup language where documents must be marked up correctly and "well-formed".

XHTML stands for EXtensible HyperText Markup Language
XHTML is almost identical to HTML 4.01
XHTML is a stricter and cleaner version of HTML 4.01
XHTML is HTML defined as an XML application
XHTML is supported by all major browsers.

hello
I mention some point about XHTML. XHTML stands for EXtensible HyperText Markup Language and is the next step in the evolution of the Internet. The XHTML 1.0 is the first document type in the XHTML family.
XHTML is almost identical to HTML 4.01 with only few differences. This is a cleaner and more strict version of HTML 4.01. If you already know HTML then you need to give littel attention to learn this latest variant of HTML.

XHTML (Extensible HyperText Markup Language) is a family of XML markup languages that mirror or extend versions of the widely used Hypertext Markup Language (HTML), the language in which web pages are written.

XHTML is HTML written as XML.

- XHTML stands for EXtensible HyperText Markup Language
- XHTML is almost identical to HTML 4.01
- XHTML is a stricter and cleaner version of HTML 4.01
- XHTML is HTML defined as an XML application
- XHTML is supported by all major browsers.

XHTML stands for EXtensible HyperText Markup Language and is the next step in the evolution of the Internet. The XHTML 1.0 is the first document type in the XHTML family.

XHTML was developed by the W3C to help web developers make the transition from HTML to XML. By migrating to XHTML today, web developers can enter the XML world with all of its attendant benefits, while still remaining confident in their content's backward and future compatibility.